Spring loaded eccentric turning tool

ABSTRACT

A device is provided that is used on a lathe for holding a cutting tool. It is designed to follow any eccentricities encountered when working with off-center rollers.

United States Patent [191 Hoke Oct. 9, 1973 SPRING LOADED ECCENTRICTURNING 1,407,764 2/1922 Osberg 29/97.5 TOOL 1,245,020 10/1917 Pianarosa29/97.5

Inventor: William A. Hoke, 517 Overdale Rd.,

Baltimore, Md. 21229 Filed: Oct. 12, 1971 Appl. No.: 188,118

US. Cl. 82/36 R, 29/97.5 Int. Cl 1323b 29/14 Field of Search 82/36 R;29/97.5

References Cited UNITED STATES PATENTS 42 12/1945 Drake 29/97.5

Primary Examiner-Leonidas Vlachos Attorney-Walter G. Finch [5 7]ABSTRACT A device is provided that is used on a lathe for holding acutting tool. It is designed to follow any eccentricities encounteredwhen working with off-center rollers.

7 Claims, 4 Drawing Figures PATENTEDUBT 9W 3.163.721

SHEU 1UP 2 F/GZI WILL/AM A. HOKE INVENTOR A T TORNE Y SHEET 2 OF 2PATENTEIJ 9|975 II "II N wbl IN VE N TOR A TTORNEY WILL/AM A, HOKESPRING LOADED ECCENTRIC TURNING TOOL It consists of two metal plates,joined together at the top by a pivot screw assembly, and spring loadedon the bottom. One plate is held stationary in the tool holder of thelathe, while the other plate is movable and has the cutting toolattached to it. The spring is adjustable, and it is used to control thetension of the cutting tool against the roller that is being workedupon, thereby allowing the cutting tool to follow the roller, be itconcentric or eccentric.

This invention relates generally to lathes, and more particularly to anadjustable spring loaded eccentric turning tool.

When a conventional lathe is used, as an example, to remove rubber orplastic covering from steel rollers, a problem arises in that the steelroller cores do not always run dead true when placed on center. They maybe eccentric as much as three-eights of an inch. Thus, when an eccentricroller is encountered, while using the conventional lathe tool set-up,that is, an unyeilding cutting tool, some of the metal surface of thesteel roller will be inadvertantly removed along with the rubber orplastic covering. This is prohibitive in most cases.

It is, therefore, the object of this invention to provide a unique toolfor removing the rubber or plastic covering from a steel roller, thatwill allow the cutting edge of the tool to follow any eccentricities inthe'steel cores of the rollers that may be encountered.

This is accomplished by having the cutting tool attached onto anadjustable spring loaded, movable plate. This plate is pivot mountedonto a stationary plate which, in turn, is attached onto theconventional tool holder on the lathe.

Another object of this invention is to provide a spring loaded cuttingtool which permits the use of the latest type carbide cutting tools, andwhich is a standard, replacable, shelf item giving long service, withoutgrinding or replacing the tool.

Other objects and attendant advantages of this invention will becomemore readily apparent and understood from the following detailedspecification and accompanying drawings in which:

FIG. 1 is a perspective view of a spring loaded eccentric turning toolincorporating features of this invention, attached to a conventionaltool holder, on a lathe;

FIG. 2 is a side view of the tool assembly, showing the cutting toolpositioned against the roller which is being worked upon;

FIG. 3 is an end view of the tool assembly as shown in FIG. 2; and

FIG. 4 is a cross section taken along line 4-4 of FIG. 1, showing twoplates of the tool held together by the pivot screw assembly.

Referring now in detail to the drawings inwhich like reference numbersrefer to like parts in all figures, in FIG. 1 there is shown a springloaded eccentric turning tool assembly attached to a conventional toolholder 50 on a lathe 60. This assembly 10 is an adapter to hold thecutting tool 34. It consists of a standard cutting tool 34 which isattached by it attaching plate 36 to a plate 12. This plate 12 ismovable, being pivoted at its top by a pivot assembly 15, which consistsof a screw 16, a nut 18 and a bushing 20, as viewed best in FIG. 4. Themovable plate 12 is mounted by a pivot assembly onto a second,stationary plate 14, which, in turn, is attached to the lathe 60 toolholder 50. The spring 22 is mounted, one end, by its attaching block 26,onto the movable plate 12. The other end of the spring 22 is mounted, byits attaching block 28, onto the stationary plate 14. The tension of thespring 22 is adjustable by the action of screw 24 to provide adequatecutting force for the various sizes and different materials of the work38.

In FIG. 2 and 3, there is shown the cutting edge 35 of the cutting tool34 pressed against the roller 38 that is being worked upon. As theroller 38 rotates, the tool 34 will follow it, be it running concentricor eccentric. The stop 30 which is mounted onto, and governs the travelof, the movable plate 12, is adjusted by the action of the screw 32.

In FIGS. 1, 2 and 3, there is shown a guide which is secured to thebottom of the stationary plate 14 and which receives the bottom of themovable plate 12. The guide provided a means for insuring that themovable plate 12 is retained in the plane in which it is suspended fromthe pivot assembly 15. The guide includes a slot having side walls whichare spaced apart a distance sufficient to receive the base of themovable plate 12 therebetween. The base of the slot is contoured, asshown in FIGS. 1 and 2, in structure complementary to the bottom contourof the movable plate 12 to permit freedom of movement of the base withinthe slot.

Obviously many modifications and variations of the present invention arepossible in light of the above teachings. It is, therefore, to beunderstood that within the scope of the appended claims the inventionmay be practiced otherwise than as specifically described.

What is claimed is:

l. A spring loaded eccentric turning tool assembly for holding a cuttingtool which will follow eccentricities encountered when working onoff-center rollers, comprising, a pair of structural members, one ofsaid structural members being fixed to the tool holder of a lathe, theother of said pair of structural members having opposite ends, means forpivotally mounting said structural members together so that the otherstructural member of said pair of structural members is mounted forpivotal movement about the upper end thereof, a cutting tool mounted onsaid movable structural member intermediate the opposite ends thereofand extending laterally in one direction from one side of said movablestructural member, for cutting material from a roller, spring loadedbiasing means attached to said structural members at the opposite end ofsaid movable structural member to provide a predetermined amount oftension for said cutting tool in the same direction in which the toolextends laterally from said movable structural member, means foradjusting the tension of said spring loaded biasing means, and meansaffixed to said fixed structural member for receiving and guiding thelower end of said movable member as said movable member moves under theforce of said biasing means.

2. A spring loaded eccentric turning tool assembly as recited in claim1, and additionally said means for adjusting the tension of said springloaded biasing means being positioned to permit adjustment during acutting operation.

3. A spring loaded eccentric turning assembly as recited in claim ll,wherein said structural members consist of plates pivotally mountedtogether along one end.

4. A spring loaded eccentric turning assembly as recited in claim 1,wherein said spring loaded biasing means consists of a coiled spring.

5. A spring loaded eccentric turning assembly as recited in claim 1,wherein the cutting tool extends in one direction from an intermediatesection of said movable structural member and is movable to and froabout said pivotal mounting and forces resulting from the tension ofsaid spring loaded biasing being urged in substantially the samedirection about said pivotal mounting to permit to and fro movement ofthe tool in response to the eccentricities of the off-center rollers.

6. A spring loaded eccentric turning assembly as recited in claim 1, andadditionally adjustable means base within said slot.

1. A spring loaded eccentric turning tool assembly for holding a cuttingtool which will follow eccentricities encountered when working onoff-center rollers, comprising, a pair of structural members, one ofsaid structural members being fixed to the tool holder of a lathe, theother of said pair of structural members having opposite ends, means forpivotally mounting said structural members together so that the otherstructural member of said pair of structural members is mounted forpivotal movement about the upper end thereof, a cutting tool mounted onsaid movable structural member intermediate the opposite ends thereofand extending laterally in one direction from one side of said movablestructural member, for cutting material from a roller, spring loadedbiasing means attached to said structural members at the opposite end ofsaid movable structural member to provide a predetermined amount oftension for said cutting tool in the same direction in which the toolextends laterally from said movable structural member, means foradjusting the tension of said spring loaded biasing means, and meansaffixed to said fixed structural member for receiving and guiding thelower end of said movable member as said movable member moves under theforce of said biasing means.
 2. A spring loaded eccentric turning toolassembly as recited in claim 1, and additionally said means foradjusting the tension of said spring loaded biasing means beingpositioned to permit adjustment during a cutting operation.
 3. A springloaded eccentric turning assembly as recited in claim 1, wherein saidstructural members consist of plates pivotally mounted together alongone end.
 4. A spring loaded eccentric turning assembly as recited inclaim 1, wherein said spring loaded biasing means consists of a coiledspring.
 5. A spring loaded eccentric turning assembly as recited inclaim 1, wherein the cutting tool extends in one direction from anintermediate section of said movable structural member and is movable toand fro about said pivotal mounting and forces resulting from thetension of said spring loaded biasing being urged in substantially thesame direction about said pivotal mounting to permit to and fro movementof the tool in response to the eccentricities of the off-center rollers.6. A spring loaded eccentric turning assembly as recited in claim 1, andadditionally adjustable means mounted on sAid movable structural andengagable with said fixed structural for precluding movement of thecutting tool beyond a selected point toward the off-center rollers.
 7. Aspring loaded eccentric turning assembly as recited in claim 1, andadditionally said guiding and receiving means including a slot havingsidewalls spaced to receive the base of said movable structural memberand the base of said slot being formed with structure complementary tothe bottom of said movable structural member to permit freedom ofmovement of said base within said slot.